#Python-Advance  #Python 

First Class functions in Python

  • In Python when functions treated like any other variable then they are term as First-class functions
  • Properties of first class functions:
    • Assign to a variable.
    • Pass the function as a parameter to another function.
    • Return a function from another function.
def one(msg):
    print(msg)
one("Hello!")

two = one
two("Hello!")

Functions are objects –> assigning function to a variable.

def shout(text):
    return text.upper()
print(shout('Hello'))

# assigned to var
yell = shout
print(yell('Hello'))

Functions can be passed as arguments to other functions

def shout(text):
    return text.upper()

def whisper(text):
    return text.lower()

def greet(func):
    greeting = func("Hi, function ")
    print(greeting)

# passed as arguments
greet(shout)
# HI, FUNCTION
greet(whisper)
# hi, function

Functions can return another function

def adder1(x):
    print("adder1" + x )
    return adder2

def adder2(y):
    print("added2" + y)

adder = adder1('One')
print(adder)
adder('two')

Reference